MARC 21 Format for Authority Data: 450: See From Tracing-Topical Term (Network Development and MARC Standards Office, Library of Congress)

First Indicator	Second Indicator
Undefined # - Undefined	Undefined # - Undefined


Subfield Codes
$a - Topical term or geographic name entry element (NR) $b - Topical term following geographic name entry element (NR) $g - Miscellaneous information (R) $i - Relationship information (R) $v - Form subdivision (R) $w - Control subfield (NR) /0 - Special relationship /1 - Tracing use restriction /2 - Earlier form of heading /3 - Reference display $x - General subdivision (R)	$y - Chronological subdivision (R) $z - Geographic subdivision (R) $4 - Relationship (R) $5 - Institution to which field applies (R) $6 - Linkage (NR) $8 - Field link and sequence number (R)

Tracing for a topical term see from reference.

Used in an established heading or established heading and subdivision record to trace a see from reference from a topical term not used in an established heading.

Most of the content designators defined for field 450 are the same as those defined for field 150 (Heading-Topical Term), field 550 (See Also From Tracing-Topical Term), and field 750 (Established Heading Linking Entry-Topical Term). Description, guidelines, and input conventions for shared content designators are given in the X50 Topical Terms-General Information section.

Guidelines for using subfield $w (Control subfield), subfield $i (Relationship information), and subfield $4 (Relationship) in field 450 are given in the Tracings and References-General Information section.

■ EXAMPLES

150	##$aAfrican drama (English)
450	##$aEnglish drama$xAfrican authors

150	##$aMusic$xTheory$y15th century
450	##$aMusic$y15th century$xTheory

150	##$aGrammar, Comparative and general$xExclamations
450	##$aExclamations (Linguistics)

450 - See From Tracing-Topical Term (R)

FIELD DEFINITION AND SCOPE

GUIDELINES FOR APPLYING CONTENT DESIGNATORS

■ EXAMPLES